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04-08-08, 07:51 AM
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#1 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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Castor for 39's
Castor angle for my cruiser?
what Castor should i run for 39" tires? positive how much? __________________ Lock, Stomp and Steer, No Fear
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04-08-08, 08:18 AM
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#2 |
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IH8MUD Rookie
Join Date: Nov 2007
Location: perth australia
Posts: 8
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am i missing somthing ??thought you had 37"pro comps. and had allready done the c&t,why would the castor angle need to be changed for bigger tyres??
__________________ 88 vx sahara 12ht auto twin factory lockers 4"lift 37"mtr's |
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04-08-08, 08:21 AM
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#3 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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im going to have 40's or bigger later. (trying to break things)
i have cut the knuckles but i havnt welded them up yet as i want to get the castor a1 __________________ Lock, Stomp and Steer, No Fear
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04-08-08, 09:10 AM
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#4 |
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IH8MUD Rookie
Join Date: Feb 2007
Posts: 67
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negative castor you mean........top to the rear , bottom to the front. i do 4 degrees on mine.
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04-08-08, 09:35 AM
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#5 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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hmmm yeah top back, some people/pictures say positive some say negatave is top back....
__________________ Lock, Stomp and Steer, No Fear
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04-08-08, 11:53 AM
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#6 |
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......what?
Join Date: Feb 2005
Location: Blacksburg VA or Albemarle NC
Posts: 3,971
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4-6 should be good. It's preference though, some people like more some people like less. Factory is 4 though.
__________________ '92 - 3FE POWER'D! -- Slee 6"/OME 863J, Pro-Comp 14" ES3000/N74L, Gen. 2 Slee Front Control Arms, T-G Sliders, Ext. Diff. Breathers, DBA Gold S/D Rotors, Slee SS Brake Lines, 5.29s, Aussie Locker'd rear, 37x14 IROK Bias/38.5x11 Boggers, some black bed-liner on the outside, some orange inside, 180k. '85 Honda Accord - 55MPG!!! -- No air filter, Custom Burple (blue and purple) Paint. Upstate Cruisers |
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04-08-08, 12:50 PM
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#7 | |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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Quote:
Postive Caster is always towards the rear of the truck. 5* is a good number. __________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-08-08, 04:48 PM
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#8 | |
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IH8MUD Lifer
Join Date: Apr 2003
Location: Panamá
Posts: 9,225
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Quote:
I thought ( based on my personal apreciations ) that more caster, more strees in your steering pump / box under turns .. |
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04-08-08, 05:15 PM
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#9 |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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There are diminishing returns on the actual caster #.
5 is a good median. I pretty much guarantee that you won't know the difference between 4 and 5* And yes, it is harder on your PS system, but hell, wheeling is hard on it too 
__________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-09-08, 05:29 AM
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#10 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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so thats 5* from zero? in the up back direction?
__________________ Lock, Stomp and Steer, No Fear
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04-09-08, 09:21 AM
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#11 |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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0* means the kingpins are directly above each other.
5* means the top KP is moved to the back of the truck. Picture the limbo
__________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-09-08, 09:45 AM
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#12 |
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IH8MUD Regular
Join Date: Jun 2002
Posts: 366
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Or picture this.....
__________________ Got Rice? |
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04-10-08, 05:35 AM
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#13 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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cheers med
cheers guys __________________ Lock, Stomp and Steer, No Fear
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04-11-08, 06:36 AM
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#14 |
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IH8MUD Regular
Join Date: Aug 2007
Posts: 216
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Would that mean that on a trail rig 0* would be beneficial?
Less stress on steering box, and no undesirable wheel straightening up 
__________________ Thanks friend but I'm not calculating anything. Im just going on the "if I can get it to fit" calculator You don't need adaptor plates. That's what gaffer tape was invented for. |
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04-11-08, 08:47 AM
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#15 |
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IH8MUD Rookie
Join Date: Feb 2008
Location: appleton/WI
Posts: 5
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neg. 5 is really good number but on rocks and not daily driver more would give the steering of a grader which helps to pull around objects!
__________________  I did it again !
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04-11-08, 10:09 AM
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#16 |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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I ran my 40 for a while like that
It sucked on and off road.. The stresses on the axle from proper caster nothing compared to wheeling the rig.. __________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-11-08, 10:14 AM
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#17 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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what about if i do some onroad kms?
__________________ Lock, Stomp and Steer, No Fear
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04-11-08, 10:22 AM
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#18 |
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IH8MUD Rookie
Join Date: Feb 2008
Location: appleton/WI
Posts: 5
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On our race truck ( pics in Woodys photo page ) we run 13 neg. camber now that is very xtreme but works scary well! But if I was to do a trail rig use with moderate road travel I would with out a doubt run 7 neg. and if I do remember right Woodys when we did it is 6-7 neg.
__________________ I did it again !
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04-11-08, 10:40 AM
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#19 |
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IH8MUD Regular
Join Date: Jan 2007
Posts: 250
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so by negative you meen positive? lol
__________________ Lock, Stomp and Steer, No Fear
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04-11-08, 11:15 AM
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#20 |
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IH8MUD Rookie
Join Date: Feb 2008
Location: appleton/WI
Posts: 5
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When I say neg. the front axle -top ball joint goes the back of the truck !
__________________ I did it again !
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04-11-08, 11:16 AM
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#21 |
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IH8MUD Rookie
Join Date: Feb 2008
Location: appleton/WI
Posts: 5
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I guess from Woodys drawing that it would mean pos.
__________________ I did it again !
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04-11-08, 11:26 AM
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#22 |
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......what?
Join Date: Feb 2005
Location: Blacksburg VA or Albemarle NC
Posts: 3,971
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Calling it camber and saying it's negative, unless you ARE talking about camber...makes me wonder....
__________________ '92 - 3FE POWER'D! -- Slee 6"/OME 863J, Pro-Comp 14" ES3000/N74L, Gen. 2 Slee Front Control Arms, T-G Sliders, Ext. Diff. Breathers, DBA Gold S/D Rotors, Slee SS Brake Lines, 5.29s, Aussie Locker'd rear, 37x14 IROK Bias/38.5x11 Boggers, some black bed-liner on the outside, some orange inside, 180k. '85 Honda Accord - 55MPG!!! -- No air filter, Custom Burple (blue and purple) Paint. Upstate Cruisers |
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04-11-08, 07:05 PM
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#23 | |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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Quote:
__________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-11-08, 11:18 PM
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#24 |
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......what?
Join Date: Feb 2005
Location: Blacksburg VA or Albemarle NC
Posts: 3,971
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I'll take your word for it
__________________ '92 - 3FE POWER'D! -- Slee 6"/OME 863J, Pro-Comp 14" ES3000/N74L, Gen. 2 Slee Front Control Arms, T-G Sliders, Ext. Diff. Breathers, DBA Gold S/D Rotors, Slee SS Brake Lines, 5.29s, Aussie Locker'd rear, 37x14 IROK Bias/38.5x11 Boggers, some black bed-liner on the outside, some orange inside, 180k. '85 Honda Accord - 55MPG!!! -- No air filter, Custom Burple (blue and purple) Paint. Upstate Cruisers |
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04-12-08, 02:38 AM
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#25 | |
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IH8MUD Regular
Join Date: Aug 2007
Posts: 216
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Quote:
__________________ Thanks friend but I'm not calculating anything. Im just going on the "if I can get it to fit" calculator You don't need adaptor plates. That's what gaffer tape was invented for. |
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04-12-08, 11:34 AM
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#26 | |
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what he said
Join Date: Feb 2002
Location: Las Vegas
Posts: 11,207
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Quote:
__________________ I am kinda gay....... My Myspace http://profile.myspace.com/index.cfm...endid=75712409 "Mary Poppins: In every job that must be done, there is an element of fun. You find the fun and - SNAP - the job's a game." |
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04-12-08, 06:02 PM
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#27 | |
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IH8MUD Regular
Join Date: Aug 2007
Posts: 216
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Quote:
 ok cheers. __________________ Thanks friend but I'm not calculating anything. Im just going on the "if I can get it to fit" calculator You don't need adaptor plates. That's what gaffer tape was invented for. |
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04-13-08, 01:09 AM
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#28 |
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IH8MUD Regular
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Setting caster to zero will make it a scary ride. It wont want to go straight to save its life... You will have to HOLD THE WHEEL and pay attention because it will dart from left to right like its on crack. Very bad mojo...
Positive caster is just as the picture states. IF you insist on calling it negative even though the upper kingpin is tilted to the rear of the truck all your doing is making yourself to sound like a fool. (no offense)  Negative caster makes it easier to turn the wheel. Positive makes it track better. Both pos. and neg. caster will make the wheel return to center. Pos. just makes it go straight better but with some added resistance. Ive seen some Mercedes spec'ed at almost 20 deg pos. caster. Suspension version 2 for our Camaro will be in the neighborhood of 7-8 deg. pos. My FJ40 will be around 8-10 deg. pos. Better for higher speeds and I want it to go straight when on the road without having to pay ALOT of attention to it.  If you have any type of power steering system I see no reason to set caster to a neg. number. This is my opinion and may or may not reflect the veiws of those who may or may not give a crap... Chris 
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04-13-08, 01:15 AM
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#29 |
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IH8MUD Regular
Join Date: Aug 2007
Posts: 216
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 I do give a **** and your comments are well worthwhile. And by having such a big positive castor in your L/C how does it affect how heavy the steering is? If I plan on running Hydro-assist will it make any difference? __________________ Thanks friend but I'm not calculating anything. Im just going on the "if I can get it to fit" calculator You don't need adaptor plates. That's what gaffer tape was invented for. Last edited by OpTimuS; 04-13-08 at 01:37 AM. |
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